Air-duct means for air-cooled internal-combustion engines



p 23, 1952 K. SONDEREGGER 2,

AIR DUCT MEANS FOR AIR-COOLED INTERNAL-COMBUSTION ENGINES Filed March 10, 1948' Patented Sept. 23, 1952 AIR-DUCT MEANS FOR AIR-COOLED IN- TERNAL-COMBUSTION ENGINES Konrad Sonderegger, Winterthur, Switzerland,

assignor to Schweizerische Lokomotivand Maschinenfabrik, Winterthur, Switzerland Application March 10, 1948, Serial No. 14,038

V In Switzerland March 14, 1947 2 Claims. (01. 123-4137) My invention relates to improvements in ducting-means for supplying combustion-air as well as cooling-air to an internal combustion engine; and the main object of my improvements is to provide a' one-piece cowl flanged to the motor block and which comprises the ducts for the combustion air as well as those for the cooling-air.

I attain this and related objects by the arrangement illustrated, in one form of invention, in the accompanying drawing, in which:

Fig. 1 shows a horizontal section, on the line II of Fig. 2, through th air-cooled motor, and

Fig. 2 a cross-section thereof on the broken line II--II of Fig. 1.

The represented in-line engine comprises four cylinders |-4 which are equipped with coolingfins 5 for air-cooling. Each cylinder is screwed down onto the block 9 by means of a flange I, and is surrounded by a jacket l which is fixedly secured to the block 9 and serves for guiding the cooling-air. The combustion air enters intothe cylinders through four intak pipe connections l2, and the exhaust gases leave the cylinders through the four pipe connections l3 into the manifold I l. The combustion air is supplied by the radial cylinder blower I7, and the cooling-air by the blower H3. The two blowers are driven from the motor shaft through a V-belt 29. The combustion air is sucked by the blower I through the air filter l5, and flows through the ducts 2|, in direction of the arrows l9, into the four cylinder-intakes I2. The cooling-air is delivered by the blower I8 into the chamber 22, formed within a cowl 25 which is flanged to the jacket Ill. The chamber 22 opens into the space surrounding the cylinders within the jacket l0, so that the cooling air entering into the chamber 22 flows over the cylinder fins and is discharged through the three exit apertures 23. The pipe coils of a cooler 24 for the motor lubricating oil are housed in the chamber 22. The said duct-s 2| are housed in the cowl 25 which also is provided for conducting the cooling-air, and are bolted down onto the motor block together with the said cowl. The ducts 2| form together with the cowl 25 a single casting, the ducts extending internally along the wal1 of the cowl, thus leaving within the cowl sufficient free space for the passage of the cooling air. The separating faces 26 between the flanges of the ducts 2| and those of the air-intakes l2 of all the cylinders, as well as the separating faces 21 be- 2 tween the cowl 29 and the jacket I0, are all situated in the same vertical plane.

When no supercharger ll is provided for, the filter I5 obviously may be directly secured to the cowl 25, and the air then also is conducted in direction of the arrows l9 (Fig. 1) into the intake pipe connections I2. I

What I claim as new, and desire to secure by Letters Patent, is:

In the claims:

1. In a multi-cylinder, air-cooled internal combustion engine having its cylinders arranged inline, said engine having a cowl extending laterally along the cylinders for delivering cooling air to the cylinders, and combustion air ducts connected to each cylinder, said air ducts extending internally of the cowl along the wall thereof and being integral with the cowl to form a single casing flanged to the engine, the flange surfaces being all situated in a single plane.

2. In a multi-cylinder, air-cooled internal combustion engine having its cylinders arranged inline, said cylinders being provided with cooling fins, a jacket surrounding the cylinders for guiding cooling air along said fins, a cowl extending laterally along the engine and flanged to the jacket, a blower for'delivering cooling air through said cowl and into said jacket, combustion air ducts flanged to each cylinder, said air ducts being formed integrally with the cowl and extending internally along the wall thereof to provide for 'an unobstructed passage of cooling air through said cowl, the flange joints between said combustion air ducts and the cylinders and the flange joints between the cowl and said jacket being all situated in a single plane.

KONRAD SONDEREGGER,

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

